Melody

tg15∘⋅tg25∘⋅tg35∘⋅tg85=? help pls

I do not understand what you are asking.

It is already to the nearest hundredth

Well you do use a dashed line to show symmetry ....   I guess that is what you mean. 

It isn't. It is just too big to be calculated by this, and most other, calculators.

Here is your answer if your really want to know.

\(y=2.1^{1095}\\ logy=log2.1^{1095}\\ logy=1095log2.1\\\)

1095*log(2.1)=  352.8301277336416335

\(logy\approx 352.8301277336416335\\ logy\approx 352+0.8301277336416335\\ y\approx 10^{352+0.8301277336416335}\\ y\approx 10^{0.8301277336416335}*10^{352}\\\)

10^(0.8301277336416335) = 6.7628185252517102253

\(y\approx 6.7628185252517102253 \times 10^{352}\\ 2.1*10^{1095} \approx 6.7628185252517102253 \times 10^{352}\\\)

A problems is being discussed here.

Why is acos(1.5) an error? Isn't that just asking how many radians it takes to reach 1.5 degrees around a circle?

No it is not asking changing radians to degrees

acos is the same as inverse cos.

It is saying  if    \(cos\theta =1.5 \text{ then what is }\theta\)

Well the cos of any angle must be between -1 and +1

1.5 is outside this range so the question does not make sense.

If you want to know how many radians in 1.5 degrees then think of it like this

\(360^\circ=2\pi ^c \\ 180^\circ=\pi ^c \\ 1^\circ=(\frac{\pi}{180})^c\\ 1.5^\circ=(\frac{1.5*\pi}{180})^c\\ 1.5\;degrees=\frac{\pi}{120}\;radians\\ \)

Thanks Guest,

Ok lets look at this.   I am redoing your working in the hope that all becomes clear to me.  

First a definition:

Prime triplet . 

set of three prime numbers Which form of arithmetic sequence with common difference two is called a triplet prime .

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